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Recently I am confused about this thing: according to the I-V curve, the resistance is 0 at zero bias, however, the conductance is finite by Andreev reflection? Is there a contradictory? Thanks!
Josephson junctions are a type of superconducting device that consists of two superconducting materials separated by a thin insulating barrier. They work by allowing the flow of supercurrent, a phenomenon where electrons pair up and move through the junction without resistance.
The contradiction surrounding Josephson junctions is that they exhibit both classical and quantum mechanical behaviors, which seems to contradict the laws of physics.
This contradiction is resolved by the theory of macroscopic quantum coherence, which explains that the behavior of a large number of quantum particles can appear classical. In Josephson junctions, the supercurrent involves a large number of paired electrons, making it a macroscopic phenomenon.
Josephson junctions have various applications in electronics, particularly in the development of high-speed and low-noise devices. They are also used in quantum computing, as their ability to exhibit both classical and quantum behaviors make them ideal for processing and storing quantum information.
While Josephson junctions have many potential applications, they also face challenges such as maintaining their superconducting state in high temperatures and avoiding interference from external magnetic fields. Additionally, the fabrication process for these devices can be complex and costly.